On a sunny day with no wind, a balloon is filled with helium and floats away into the sky. Eventually, the balloon pops. Three cases of an identical balloon. In case A, the net pressure above the balloon points down, and the net pressure below the balloon points upward with a larger magnitude. In case B, the net lateral pressure is represented by several horizontal arrows on each side of the balloon pointing toward the balloon. In case C, the external pressure is represented by several arrows surrounding the balloon pointing inward and perpedicular to the balloon's surface. The internal pressure is represented by several arrows of greater magnitude inside the balloon that point radially outward. Which case explains why the balloon pops at high elevation? Case A: The net pressure acting upward and downward on the balloon squeezes it until it bursts. Case B: The net lateral pressure squeezes the balloon until it bursts. Case C: The pressure inside the balloon is greater than the pressure outside the balloon, causing the balloon to expand until it bursts.